There are exciting advances in Rydberg atom quantum science recently [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, [8]} because of the feasibility to coherently and rapidly switch on and off the strong dipole-dipole interaction. Such interaction enables simulation of quantum many-body physics [9]}, [10]}, [11]}, [12]}, [13]}, [14]}, [15]}, [16]}, [17]}, [18]}, [19]}, [20]}, [21]}, [22]}, probing and manipulation of single photons [23]}, [24]}, [25]}, [26]}, [27]}, [28]}, [29]}, [30]}, [31]}, [32]}, [33]}, [34]}, [35]}, large-scale entanglement generation [36]}, [37]}, and quantum computation [36]}, [37]}, [40]}, [41]}, [42]}, [43]}, [44]}, [45]}, [46]}, [47]}, [48]}, [49]}, [50]}, [51]}, [52]}. To date, however, most effort focused on the effect of excitation annihilation (EA) proposed in [1]}, [2]} and reviewed in [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, although there are other categories as summarized in Table REF . Belonging to the Rydberg blockade regime, EA involves single-atom Rydberg excitation and hence is not sensitive to the fluctuation of interaction. Besides EA, one can also excite both qubits to Rydberg states [1]}, or explore the antiblockade regime [62]}, [63]}, or use the resonant dipole-dipole flip [35]}, [11]}. These latter processes, however, involve two-atom Rydberg excitation and are sensitive to the fluctuation of qubit separation that can substantially reduces the fidelity of a quantum control by using them [52]}. It is an open question whether there is another means other than EA to explore the Rydberg blockade regime for efficient and high-fidelity quantum control.
